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Reject the creation of interface with the new statement

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This commit is contained in:
Alex Beregszaszi 2017-08-12 00:45:37 +01:00
parent 2c2ae74217
commit b25f0c52ac
4 changed files with 36 additions and 0 deletions
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1
Changelog.md
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@ -15,6 +15,7 @@ Bugfixes:
* Parser: Limit maximum recursion depth.
* Type Checker: Crash fix related to ``using``.
* Type Checker: Disallow constructors in libraries.
* Type Checker: Reject the creation of interface contracts using the ``new`` statement.
### 0.4.15 (2017-08-08)

6
libsolidity/analysis/TypeChecker.cpp
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@ -429,6 +429,10 @@ void TypeChecker::endVisit(InheritanceSpecifier const& _inheritance)
if (base->isLibrary())
m_errorReporter.typeError(_inheritance.location(), "Libraries cannot be inherited from.");
// Interface can have no constructors - no need to validate
if (base->contractKind() == ContractDefinition::ContractKind::Interface)
return;
auto const& arguments = _inheritance.arguments();
TypePointers parameterTypes = ContractType(*base).newExpressionType()->parameterTypes();
if (!arguments.empty() && parameterTypes.size() != arguments.size())
@ -1554,6 +1558,8 @@ void TypeChecker::endVisit(NewExpression const& _newExpression)
if (!contract)
m_errorReporter.fatalTypeError(_newExpression.location(), "Identifier is not a contract.");
if (contract->contractKind() == ContractDefinition::ContractKind::Interface)
m_errorReporter.fatalTypeError(_newExpression.location(), "Cannot instantiate an interface.");
if (!contract->annotation().unimplementedFunctions.empty())
m_errorReporter.typeError(
_newExpression.location(),

3
libsolidity/ast/Types.cpp
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@ -2140,6 +2140,8 @@ FunctionTypePointer FunctionType::newExpressionType(ContractDefinition const& _c
strings parameterNames;
StateMutability stateMutability = StateMutability::NonPayable;
solAssert(_contract.contractKind() != ContractDefinition::ContractKind::Interface, "");
if (constructor)
{
for (ASTPointer<VariableDeclaration> const& var: constructor->parameters())
@ -2150,6 +2152,7 @@ FunctionTypePointer FunctionType::newExpressionType(ContractDefinition const& _c
if (constructor->isPayable())
stateMutability = StateMutability::Payable;
}
return make_shared<FunctionType>(
parameters,
TypePointers{make_shared<ContractType>(_contract)},

26
test/libsolidity/SolidityNameAndTypeResolution.cpp
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@ -6709,6 +6709,32 @@ BOOST_AUTO_TEST_CASE(experimental_pragma)
// CHECK_ERROR_ALLOW_MULTI(text, SyntaxError, "Duplicate experimental feature name.");
}
BOOST_AUTO_TEST_CASE(reject_interface_creation)
{
char const* text = R"(
interface I {}
contract C {
function f() {
new I();
}
}
)";
CHECK_ERROR(text, TypeError, "Cannot instantiate an interface.");
}
BOOST_AUTO_TEST_CASE(accept_library_creation)
{
char const* text = R"(
library L {}
contract C {
function f() {
new L();
}
}
)";
CHECK_SUCCESS(text);
}
BOOST_AUTO_TEST_SUITE_END()
}